21703645245 has 8 divisors (see below), whose sum is σ = 34725832416. Its totient is φ = 11575277456.

The previous prime is 21703645219. The next prime is 21703645253. The reversal of 21703645245 is 54254630712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21703645245 - 2⁵ = 21703645213 is a prime.

It is a super-2 number, since 2×21703645245² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723454827 + ... + 723454856.

It is an arithmetic number, because the mean of its divisors is an integer number (4340729052).

Almost surely, 2^21703645245 is an apocalyptic number.

It is an amenable number.

21703645245 is a deficient number, since it is larger than the sum of its proper divisors (13022187171).

21703645245 is a wasteful number, since it uses less digits than its factorization.

21703645245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446909691.

The product of its (nonzero) digits is 201600, while the sum is 39.

The spelling of 21703645245 in words is "twenty-one billion, seven hundred three million, six hundred forty-five thousand, two hundred forty-five".